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Hi, I want to connect and use two sensors to MCU (nucleo64). But before that, i should understand these 2 circuits. 1- Where do we see measurement of the SOIL PROBES on Nucleo64? (It is connected to VCC not MCU.) 2- What is the purpose of the resistor on the below? Why we don't connect the HUMIDITY PROBE to the MCU (nucleo64) directly? Here is circuit: https://i.stack.imgur.com/73wNS.png |
September 20, 2019 |
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September 20, 2019 |
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Thanks. I have also two other questions. 1- Shouldn't it be two probes are there? (if i'm not wrong, there are two probes in soil moisture sensor. but it says SOİL PROBES (2) and HUMIDITY PROBE(1)) 2- whatis the purpose of 1k resistor? why we don't connect VCC to PROBE dircetly? |
September 21, 2019 |
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The 1k resistor is probably to limit the current to something reasonable if the probes are shorted to-gether |
October 05, 2019 |
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